: 2000 Deville - high pitched whistle

04-19-12, 10:14 AM
I have a 2000 deville with a high pitched whistling type sound when I am accelerating just wondering what that could be I'm new to Cadillac cars. Thanks

04-19-12, 11:22 AM
Your post is going to be moved to a new thread: 2000 Deville - high pitched whistle. Sit tight for 10 minutes............Moved from another thread - please don't hijack threads.

You might want to remove the engine beauty cover (Is this whistle coming from under the hood ?????) and snoop for vacuum leaks.

If this is NOT engine related, we'll move it to a thread of your choice, describing the location of the "whistle".

04-19-12, 11:34 AM
Torque Converter?

Faded Crest
04-19-12, 11:56 AM
Is it like a "ringing in the ear" type sound? Not sure what it's called, but there is a pressure relief valve on your intake on the opposite end of where the throttle body is. It might not be completely seated.

04-19-12, 02:35 PM
Faded, you are thinking of the pre-2000's. His is totally different. More like a pop off valve and is located under the TB.


Faded Crest
04-19-12, 02:53 PM
Oh, okay. Could that still be making the noise?

04-19-12, 08:36 PM
I suppose it is possible, but I have never heard of it like the old flapper door type. Can't hurt to check it though.

04-19-12, 09:42 PM
I have a spare manifold - the new one with the spring loaded mushroom style overpressure relief valve. It would take a real backfire and a pretty good chip of debris to hold that puppy open.....................

The PCV dirty air nipple is on the other (front)(passenger) end of the manifold.....................

This is looking straight into the manifold from the throttlebody/plenum point of view...............

04-19-12, 09:45 PM
Ahh, that's the picture I was looking for. Guess I didn't look far enough.